From: John Gibson (johngibson1541@yahoo.com)
Date: Tue Jul 10 2007 - 15:41:04 ART
We are not talking about the same thing.
Yes, (65502) is stripped when going out of the
big AS (the typically registered).
But within the big AS, when a different confed
receives "(65502)" , this "(65502)" does not
count toward "AS path length". My key emphasis is
"length" here.
My experiment has Path of "(65502) 200 i" and
"100 i" of 2 routes arriving at the router.
And I use always compare med.
When I change med (set metric) from outside the big
AS, it effects path selection. MED is lower ranked
than AS path length. This means "(65502) 200 i" and
"100 i" are considered of the same "As path length".
Mike Kraus says I am correct.
John
--- "Jason Guy (jguy)" <jguy@cisco.com> wrote:
> John,
>
> The AS-Path counts within the confederation. As
> soon as the prefix is
> advertised outside (to the real world) the
> confederation AS-path is
> stripped, and the global AS is prepended. Within
> the confederation,
> most of the same eBGP rules apply.
>
> The MED value can be set regardless of where the
> prefix is advertised
> (confed peer or other peer).
>
> Jason
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf
> Of
> > johngibson1541@yahoo.com
> > Sent: Tuesday, July 10, 2007 2:18 PM
> > To: ccielab@groupstudy.com
> > Subject: BGP path selection process, confederation
> peer's AS numbers
> > doesn't count toward AS path lengh right?
> >
> > I have tried to use MED to influence 2 routes
> >
> > one with "(65502)" confederation peer AS
> >
> > another without the confederation peer AS
> >
> > MED takes effect.
> >
> >
> > John
> >
> >
>
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